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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee2233da4dcdaede50107bc8306ca74035ec6fe7151d0cc2a1fda373fe807069' 
  AND token = 'nngVkj8UggSoChFS/F5O13pdMVM9YwNLzvdOpZcZx9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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