Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3082e97cc27a54960fbdfde6ce305fe14b3b03904b74ee5b22d1edd5b0de85f0' 
  AND token = 'rZMMKB00qeETuRduB4EMukPvm6/cnPDPjqwRFf6in4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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