Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afcc5b821d8ca264c3e17e91b0160ee3e06a74195d9791b8b34e2998de522cf' 
  AND token = 'Wxo6v2vMSulMzA/PygsaCaRe4oblVHPiY+b89iueGOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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