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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2eb03cfd6f81b6370a05a9f3d4dcf52f61f1e0b62bdb303d164aef5f90ef308e' 
  AND token = 'lQaIbd+by+PKW2BnSf6DqVGZo79r51t0v2KU5QUZOMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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