Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212bf61b3688c51dd239e032c1485a0b78d74c9fffaeee0dcc3a25f36eec4959' 
  AND token = 'UO+7QQeL/DT6gJLhMTe7qXMpu+YMIeAhegQdupTgIas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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