Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f49b1df9a88cb9d1b3f9c4728ec44f3ba3cbc5512671e2d733f5fa39afc1666' 
  AND token = 'j5qbfGOrHJOat5PEco/y3MSqpt15ki8iRWwxWJgZp3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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