Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3260a1513607d5f396502dafc5068781cbb284f52e78b926078bb1441645589e' 
  AND token = 'YZ3CWQB9hZ1ZHIAZc8m9CUdNAfAPrn87nZDpLCayilU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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