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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '545d7611fb1f700e1d85d75ffabafd1f6f423c8846dda6fc544cb6bb6600dec7' 
  AND token = 'fTEMshmdCB/T/HzcRBwXIuWbeWGn8yKYTJStd6KaSH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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