Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736c853a02d4501385a099bfb66f00d3493d6466e58c4b95d364dcf23523486d' 
  AND token = 'zSFSlYRfY5V/A0ucvnQ3G+QF+OKGjsEwNxqoE8rMOc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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