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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a8902db0efdb2ddfdb8f0b1b635bc6b9af86ce18c5ccbf6bd8b7bc33949e1f0' 
  AND token = 'z/YCIDrG+BJkg4o3ih4UksQ6F35GNFs403epqWJ0QXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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