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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bba0dac94eca10b4b5d2498b976d39b64efc7ce4ca85fe1bff459501eb8d179a' 
  AND token = 'o+PnaFxjmxQGdfLO81D6cm+n1QRcz35cnW+WXGOe27I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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