Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e88ad26d6ba161b50f4137045a3edf6e8a9bda91d17351fc3421204311ccc9' 
  AND token = 'QVUC712B4ykc4fyPgNKoE2qNtPPV8V17z4r+UQkEp2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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