Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7b47a89399e4c60b1d14f7b0c6a618ef9b074f11085b42bbdab57ed0b6b55b' 
  AND token = 'iAU7rsFYfnEvy/P6cS0hITFOvnBIFfasOEjCJoUCCJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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