SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '129ce86bbaeb72299d3adcf048a92603c0ea271fe4b62785f9cbdc55f78250c0' 
  AND token = '4jxhgStZvpSZCxwyViF0V+yGMNRhg02bdG1iq+LFwDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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