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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3461a8df7e4dd482ff39b8ef29ef896316aacb259ac29cdb1478d5f0dab4b9ce' 
  AND token = 'aQp+f24meTPPK3vRxTrIwih99daWZYlymaPfjHiiFiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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