Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272de5a437b193295270df0a74963dd254c328f8ff9eb4288bcd02e1b75d61ab' 
  AND token = 'fAxtHw0dssyn0gW0d2RNsr93STltnnzYvdtL3fGgKnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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