Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0cb02162fb201d3d4b176314b1327c553e596bf12c1f928f90c5a18c94307c' 
  AND token = '5Ui4ffoP2MoXB8MHIon7Vzr8cjiU1H/RJRpGsdhTsL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}