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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f305f273ddf981e9760df356258ae9efd413c6aee82516b6f7aa4cedc8b43908' 
  AND token = '76k0/0qPi7mxCKgJma8rlxNvW/XT0RSt4kmSSom1Fx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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