Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123545f4baadc14ad1a5e6978be7bc16b4c12bb6e13b42beeb4a474b11b679c5' 
  AND token = 'n4L3ZJF0lX5Ap7tEWrF7u/MPD81k9Y+Q4p+OxOXTDhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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