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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e482d33d90b40abad40af77030bb601e2ada284dda7b69602dba5dbc90516951' 
  AND token = 'UJ8HqUvP/LrRttG7pSYg/dJHMY0xNakV4p7LFoDP/1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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