Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e49669eb771ec184a96fcf06101b70b3939d8cdaa47fcfcd001801b5c6dbcee' 
  AND token = 'MNy2QcUa6Y/AuPHe04UvBbbfWTg7FBMr6ahj+gzRfgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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