Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1f1209ff91a6ccc769b419b9583c645ea10b42cffb8f60d8de940e41a93400' 
  AND token = 'C6HI/QvasdODBS6bsRvafXIjvdxA1bq1lPbpRQHNKoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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