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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5b0839fb44d742fc6b1bbe275e8c8a855e26dd4444adcdac4cd7be226f88c9a' 
  AND token = '2hGArT8Bykuwj9AjD96kvT56PnigVH2sRTgcoNVeUj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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