Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f462dd5c5cb4b05ddbba62cec2e1d8839bc923d081493393f6d77bc254f8c7' 
  AND token = '+pmPJRMWCRAOLtB5MtI3Xgk8SRh5kS1maHJlAm3Ms2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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