Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbaefe381c772eaf67f113f23f2bcd6141db231ef35bb3600baa12ff5428268' 
  AND token = 'PO0+awQtsP9dCC0YJ8HJZT9VZ6q0x2/u9d3pttWlMGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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