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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '868d1148422232ea60e80d879b6a1acf478b6c3ed5c45fa590c9da00da057c01' 
  AND token = 'LsLmH9UWiLeUtMsjycN5ChDzGQRi9O2b8jj7xhuJEvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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