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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '102762d828d09ff6d15fa150569be12fb2f592464c15b6dac4649c301ff7a955' 
  AND token = 'iVV19L4tAMYjbU43tt6EV1XmsY5qS53Zy+D9U9jzgI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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