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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34c1a2a3a6be9f1b5d7387217bc2abc1049c0ea7b7361b01e972e32acba08a02' 
  AND token = 'zl8tzUQFa5gWlJluQD9PqFvjz89qKK2JryJVCH6M3wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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