SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0145abb98e487ce4a5a40b2d9448e92e10bc43696ba292dfe311fd5a64181de6' 
  AND token = 'ZYasiLLleb+yPmWYjmhK2hcTNUl0/Ih9vRzDbFVCN3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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