Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37520e6624a7abf4aa7e6e078c4a3bc52444219f6fbfb89f7a54c7455ec93b59' 
  AND token = 'uJby/Ch5SN+BvtwpZ/C22NnU3Yrmy03MQ0uQiCq+qBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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