Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f6c2e5502cf1940d27dae4f189906a6211dfe51d6f933281c657edc206b660' 
  AND token = 'nop2+OqHM7eaF6AORMnIRw2V0wRjbmTLGiAaOaYg1qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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