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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '297a9f5c09e887825d346b8d9a5fb87ebed3e1b5e5943f8c1212f531bb1b4d9c' 
  AND token = 'SEaoWGP+e3o0O2Z4CDHpqlNk4o76NrIIYz5e6TAi2bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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