Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642d441b838fbb03dd716a27d01b1d12768a7c6cfdb9ea9d6349f0e4d7bf0b3a' 
  AND token = '9p84GgrSQamPeP+TJLsJv52NM2s1l0sMGhCmBKw8FVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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