Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175aa9c88a415f5ffe83b311ed74ac4496cec874a7c5f01b2683bf5efeeec84f' 
  AND token = '6WscGLFyqRaDOBFroIYdYGXjxVdoirF4BU+Wa3NuYJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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