Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbeccc0b423ed27f8fcbb40555b08df1ec1ae4f0e7521cd04ce461554a5cea1f' 
  AND token = 'C4VgBtbQf61BawqBV1xYG0eD4o0KT1oZzzYeJR6gycg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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