Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ab0e99dafdd270d40ce43c6ab2b44e774c8bfb883bdea1b09de82c1cfd604b' 
  AND token = 'D2bKS3miRwZ/oRjc05TLakEEd6x3AOwGESzW+oKML5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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