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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13393f8246bd7c042f7c789d498548386f325ef39b8308fefbaecf6a9d0fa307' 
  AND token = 'oomRi5hTpUrRJagJRqZJPFNt0AkRFj2nk7zFh5TUC5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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