Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703e062228bf1d872053e08c15987f7b6a1c81aeb761fd2140f2b3c7365a08a4' 
  AND token = 'wzy83RaeGRiUAvqnK9+zq2zjmyxBDIoH0qzQNGK59EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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