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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '328f2eb8cbc27bedb4d8749c03b496bd5623a7da1d77994201387d05e2491978' 
  AND token = 'nJLKOdlSGSzzIOt9nm2e01BkPfbF0bptHZp+a4X0pKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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