Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f43bbc6052cfffdb50fd5c706afb457b7f89bf59a0731d5d09317d55145478' 
  AND token = 'zzQUzGFHPgLih0ziwOtU0WZtcHGXe6T+pDXgRj+XTz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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