Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03ad75ecef64c556b98cac5b85900d5e9c6f2ac184029a33dde0744995affbd' 
  AND token = 'fBLF0twu1jDXrteNJQpPWb/ViWG2vas+TEDM1SKL+v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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