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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b7e03624c12b5dfffc970dde9594eac7baceba18ac396097d3561394e433d4c' 
  AND token = 'lbE1HVdSKVzu3UOVuxBZZ3Aip0fIep0i5uI8OJJMl1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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