Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2508543254c312a51d446a5de938531f557ea6b970b07a2b8ed97254955ee7a6' 
  AND token = 'rnwzNk1QP5visZ61wdJK1oGspDe/pvrpRSWt7vSYD7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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