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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d8cda761e87fc906f6356cad89e641f223882dc5b095475adc0c975b870fc8d' 
  AND token = '1UFDpJ9VPgtV4+4sDa3bbeJeHg+9bCL+/Rg+2C1QoPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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