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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f93c7e95f1f497f41dfebe80619b91316b68f91a8c433ce2c2352b6a0752287' 
  AND token = 'KFsNkf2g7WH81rc9E1Il9NWTbrnjHSnRR4fyGoJl5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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