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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa1c54a0aef5617637fe2ecf4b198263c8e54e8ebbe8a107734a0e44a4528ca1' 
  AND token = 't0HIK6rHrRKaYA7chlhw6PWrC5LKU6AmkVd4LiYYS4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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