Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b1d8d96160b3250dfaec29f55801ae2382244da066844471de4c2f2fb4df30' 
  AND token = 'rHUA1SAp8umrbIvIvtPqhDqkTFfiABAELYjeFHTnUI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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