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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4778b062d7c7eec8ddc21792630fac8d5f6eb53a2c8ece6eb618077169cb5ae5' 
  AND token = 'wAljhwHymrt2nTps9f7yJ96UfUFZyk4MRYqyxUXir/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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