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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c309b392d1eae1e386e2016ef5b08fa7219a8e0b9b36b14765cb8ca4bb6493e9' 
  AND token = '2IXjXCJBagXFHX6pHK7lkdR/0p2IlseWyBpJQHKshvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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