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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bfdd886ce54d71071cffccb5c15841ddc0b28710176f77da08f822e03a3396eb' 
  AND token = 'YnUPywVLb/ndqBBBAaEgxX+FosZ8i+ofE59NKaoXri4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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