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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '885e68537008975baf4fb4e16c4df34ab1918d52bc7d26bfefb74508b9119ce3' 
  AND token = 'I0BP/iu2hbNmluETlgMa5MMsoRneuWASZdOlNMtyEdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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