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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2807e8bf000a1eb135522034badb6c5c0b2f33b17da7f7b44630bc761cc518ef' 
  AND token = '7Na9G7l23b+VWP3ib7lTQglgtSw0msB08CZP5RjMl4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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