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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf91249fb6c9d8d0eae0405717174988c9f65ade8e883d342c3b29f782d50378' 
  AND token = 'vgQq9YO3+dbGSI8XlXF5aQ8O207cwWfnq2yMFbv+/I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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