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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e6e3522cdb0671cf6f00afbbd5fa5c2ff0fbdd28572c1692bf6671d2fc94730' 
  AND token = 'gdUreftE9lHkoY7gFPhvwC6R9GX0J641J3/L7M/bRwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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