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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd21837d54a128dbd778e4f234f2d5c419f3e4acb477b9790eac76d8cd391e225' 
  AND token = '0+HSy3t6a4aoNhsFG4/+GAZv66q9pq/cgdYY34r16is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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