Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9eab6fe200c395397c28450a6a73592c972a5a5cad8e58234555c9f9df087270' 
  AND token = 'Bs2oNEiBZznvCqeeb+K30Zsj8yhBR1PUka17Aitysq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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