Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7869a22d9aa4ad598fb5e0e38d2468e166bddfc2739550a0b62c7fc1c0d5cc' 
  AND token = 's79BHAFiXjjOyeA8GP9Bc9fNdpyYlEuqAHfo8zR6vkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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