Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bfe2f3a7b03222328bdb9c7edfee9a0d52152150a2d6c20742e8595ce7a778' 
  AND token = 'mp8U7453fskq5eQ8k+B7mNQU1c88AIvzQCJqmlhnM9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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