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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '669b1f70e86352d9a973db59c30eac95e177ec3f29e5ab3af6ae589a1314f0f9' 
  AND token = '95XaTuzc3S6uohUqPlZrqPTHYq3bb+NacF9sL6qnUfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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