Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abffe936f41db1bf8c6cfcc3dd98f5f7374b30fe3ad1b3f73a71d8c99a07acd1' 
  AND token = 'dfpj1PYPfyLVvNs57jxhoOO6ZZQl5ZKLecI3N0Z6Kc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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