Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5eb1f492679c9d6e952fc06898c44d7a648496e3419cd6822e0a669c20b87f' 
  AND token = 'W13R4kvw5KyU43fLbj7Eh4d7RfWbeUYMbA6e4Tij2eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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