Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517c2bb4fc4f94cb652fcb9160f5d1589f50228987f5d4c53caae6b0844629bc' 
  AND token = 'nsBKDSKX/K9PpcYWrYAT4+7e39uip+ftxr1q/AGdJlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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