Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fa4db21e408416794f19789045d962d69fda5581c44cb4055bc0dfeb579761' 
  AND token = '0QaMS6iIM1m7C9VRy5EGva5foi7R5QgGvhoa0qxiAtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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