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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40856b1419424b57364bd3864667f31448b0d36b32e1a254328dd6c4557e5875' 
  AND token = 'nOD0v/FjyEzagcueLAvgaLyTtQZ3xb32bo7yR/IMFIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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