Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e702cd3eccbe647e0cc27baf37b7720674e12d6a8badb7798bcbbc5635c50a' 
  AND token = 'WzywbShDG/zccsPmxvxYFan57WngHTSY3Ds++wvGhU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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