Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39948f94fa682e6547c6e32465ae8b235c5ee2dce634082b9ab2d6ac27fa7e9d' 
  AND token = 'iiU94z3Y9aQSQ1rj9YAaNx5hYtaLti1vS7IsbVsLgL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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