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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ccb63e9a330a65bc0b33e7ff02839f803c109b88ef67580ef2a48e8367d653a6' 
  AND token = 'xpRP5uVNQXA2O1rJiqpBgl4NMdwybsWH74/LyU52enM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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