Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94febffdcab5893d04b6dc82f39363d1e38991b3a85f899e6140f7c411b15a63' 
  AND token = 'RMk5aQodp0z7DDYpTTI2j3xgvk3rTKHYFma0BvPokC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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