Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5171503785e88b13ec077eb3aa00e57999cabcca46cc3ca6d371ec6872cc632d' 
  AND token = 'B+z+Ed8gRNiWLgZBkdl6Cr8CmwVCuzYGWDiV7GeTwEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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