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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74416f70f8c1591b5da59cb10da5a617df291ab51865caf38cf368618143769e' 
  AND token = 'ki0qXN0C7c7BwNyhBvZLJKIpN0DdP4NIyvy7GNyNOPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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