Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a015befc4966b4ece0bbd12c9cdaa888bf46689bb3de4bb37e75850472dee7ac' 
  AND token = '9nlvN5FGauWMDuo3lJMcaGvfvetLnyPZATEFgH8Ei2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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