Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9e0d9bc1c3da89d6cedfe7d8a8d7bab2bcd81723397f203f796787e666605d' 
  AND token = 'dhV3yptHvKxpwOor3YENjALPxaIf0UxBzeVaqZSAy6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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