Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16457efb84d842a75d42f4ea9d9a47cb4944c1a9efb6181b55e84d4a4b87a0b3' 
  AND token = 'd2vucI2AnT7qHCd06j2ftTYtkC+I4er4Iw4Os0EeF3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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